基于改良ASM1的SNAD工艺启动和优化

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Abstract An up-flow micro-oxygen membrane bioreactor (UMSB-MBR) was utilized to start up the simultaneous nitrification, anaerobic ammonia oxidation coupling with heterotrophic denitrification (SNAD) process, and a mathematical model was planned to be built to realize the start-up process analysis and the optimization process prediction. The results showed that the SNAD process (the total nitrogen removal rate of 87.66%) started up successfully by inducing the carbon source (C/N ratio of 0.5) after anammox and completely autotrophic nitrogen removal (CANON) processes in the bioreactor, and the start-up model of the SNAD process was successfully built using the ASM1model and experimental data; the model analysis revealed that the increase in the nitrogen loading rate (NLR) (from 0.24kg/(m³·d) to 1.88kg/(m³·d)) and the suitable dissolved oxygen(DO) (0.2~0.4mg/L) accelerated the start-up of the SNAD process; the model prediction revealed that the inhibition of anaerobic ammonia-oxidizing bacteria (AnAOB) from denitrifying bacteria (DNB) was strengthened with the increase in the C/N ratio (from 0.5 to 3.0), and shifted the major nitrogen removal pathway from anammox to heterotrophic denitrification process. From the comprehensive consideration, the appropriate C/N ratio should be chosen at 1.5under which the process performance and distribution of the microbial flora could be at the best state of the SNAD process.

Key words： anammox simultaneous nitritation, annmox and denitrification (SNAD) completely autotrophic nitrogen removal (CANON) mathematical model AQUASIM functional bacteria

Received: 25 December 2020

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X703.5

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	Articles by authors
	WANG Zhao-zhao
	GAO Peng
	YAN Li-na
	YIN Yao-bin
	ZHANG Huan
	WU Xin-juan
	YIN Chun-yu
	MA Jun
	LI Si-min

Cite this article:

WANG Zhao-zhao,GAO Peng,YAN Li-na等. Start-up and optimization of SNAD process based on modified ASM1[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3590-3600.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I8/3590

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